Numerical simulation of factors affecting spontaneous combustion of coal pile during oxidation heating
Spontaneous combustion of coal piles in open pit coal yards can bring economic losses and safety hazards to power plants.In order to explore the influence of relevant factors on the spontaneous combustion of coal pile,a slow oxidation reaction model of coal pile is established based on the porous medium model.The influence of coal type,porosity and coal pile volume factors is studied,and the temperature rise curve and temperature distribution inside the coal pile are obtained.The results show that when the coal has high calorific value and low activation energy,the time to reach the critical spontaneous combustion temperature will be shorter and the risk of spontaneous combustion will be larger.Compared with the influence of calorific value,the activation energy has greater influence on coal spontaneous combustion;the porosity of the coal pile is smaller,it takes more time to reach the critical spontaneous combustion temperature,but the area with spontaneous combustion risk also increases;The larger the coal pile,the larger the area of the internal high-temperature area,the greater the risk of spontaneous combustion.
coal pilenatural stackingporous medium modeltemperature distributioncritical spontaneous combustion timenumerical simulation
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